• With respect to mercury and POPs, how are pollutant deposition and U.S. population exposure affected by changes in emissions in other countries?

  • What is the level of confidence in these estimates?

  1. How are foreign emissions sources expected to change in the future and how might these changes affect achievement of environmental policy objectives in the United States related to air quality, pollutant deposition, and radiative forcing?

  2. How does international transport of air pollutants out of the United States affect air quality, pollutant deposition, radiative forcing, and the achievement of related environmental policy objectives in other parts of the world?

  3. What additional research, observations, analysis, and information management efforts, are needed to better understand and quantify the impacts and implications of the international transport of air pollutants?

Although the committee is encouraged to provide quantitative information to the extent possible, qualitative analysis and discussions may prove appropriate for some topics, especially where the degree of confidence is uncertain. Local scale air pollution issues within shared international transboundary airsheds (such as El Paso-Juarez and Detroit-Windsor) will not be addressed.


The Committee met five times over the course of 18 months from June 2008 to April 2009. These meetings encompassed discussions of the Statement of Task and its context with the study sponsors and other government stakeholders, reviews of the existing literature, presentations from a variety of scientific experts, and evaluation and synthesis of this information into a final consensus report. This report was submitted for peer review in June 2009 and approved for publication in August 2009.

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